the act of having to get dressed up completely for an activity. in sports, when a player who might usually just wears shorts and a t-shirt to practice has to put on his full uniform for practice, he is said to be going"full gorilla". Can be applied in the business world as well, if you wear business casual but have to wear suits for meetings, those days with meetings you are going "full gorilla".

"I'd like to go, but i don't want to have to go full gorilla."
"Do we have to go full gorilla for batting practice today?"